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Dessert

Apple Filling for Cake

A sweet apple filling for cakes made with sugar, egg, grated apple, lemon peel, and lemon juice.

From an old cookbook · modernised transcription
From a historical cookbook (Internet Archive) · 4 ingredients
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Why it works: Apple and lemon are a kitchen classic. They rank in the top 14% of all ingredient pairs, and cooks put them together in 7,551 recipes. Both carry trans-2-nonenal, which smells cardboard, fatty. The science ↓

Apple Filling for Cake

Ingredients

Directions

Make the filling

  1. In a kettle, combine sugar, egg, grated apple, lemon peel, and lemon juice.

  2. Place the kettle in hot water and bring the mixture to a boil while stirring.

  3. Remove from heat and let it cool.

Assemble

  1. Spread the filling between layers of cake.

Recipe from a historical cookbook (Internet Archive).

Transcribed from a scanned cookbook and modernised for today's kitchens. Where the book gave no heat or time, or said "a moderate oven", the temperatures and times here may be modern equivalents rather than the book's own figures.

Explore the science

The flavor team

The pairs that carry this dish. Each one is judged two ways: how much their aromas overlap, and how often cooks already put them together.

  1. Apple + lemontop 14% of all pairs
    Smell alikemoderate
    Cooked together7,551 recipes

    Shared aroma: trans-2-nonenal (cardboard, fatty).

  2. Sugar + appletop 18% of all pairs
    Smell alikelow
    Cooked together16,478 recipes

    Shared aroma: beta-damascenone (apple, rose).

  3. Sugar + lemontop 18% of all pairs
    Smell alikelow
    Cooked together53,532 recipes

    Shared aroma: 2-nonenal (fatty, green).

  4. Egg + lemontop 19% of all pairs
    Smell alikelow
    Cooked together44,316 recipes

    Shared aroma: (e,e)-2,4-decadienal (fatty, deep fried).

  5. Sugar + eggtop 21% of all pairs
    Smell alikemoderate
    Cooked together122,807 recipes

    Shared aroma: 2-nonenal (fatty, green).

Sugar and apple barely smell alike, yet cooks put them together in 16,478 recipes: they work on texture and structure more than aroma.

Ranks compare each pair with 20,000 random ingredient pairs on CompKitchen. How we score pairs

What each ingredient does

Egg
Thickens the filling as it heats and sets it into a soft, spreadable custard.
Sugar
Sweetens the filling and helps balance the tartness of the apple and lemon.
Sour apple
Adds moisture and tart flavor, and its grated pulp softens into the filling.
Lemon
Adds acidity and bright aroma that cut through the sweetness.

The step that matters

Bring the mixture to a boil while stirring. The egg must be heated enough to thicken the mixture, but stirring constantly keeps it from scorching or curdling on the bottom of the kettle.

Swap the apple

How well each one fits the dish's main ingredients (sugar, egg, lemon):

  1. Orangefits better
  2. Vanillafits better
  3. Limefits better
  4. Applethe original

Fit is the average pairing score against sugar, egg, lemon. Candidates are from the same food group and used in at least 100 recipes.

“What each ingredient does” and “The step that matters” were written by Claude from this recipe’s own method and reviewed in samples by CompKitchen.

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